9998790 has 64 divisors (see below), whose sum is σ = 25698816. Its totient is φ = 2483712.

The previous prime is 9998777. The next prime is 9998797. The reversal of 9998790 is 978999.

9998790 = T₆₄₄ + T₆₄₅ + ... + T₆₈₈.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9998797) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29502 + ... + 29838.

It is an arithmetic number, because the mean of its divisors is an integer number (401544).

Almost surely, 2^9998790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9998790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12849408).

9998790 is an abundant number, since it is smaller than the sum of its proper divisors (15700026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9998790 is a wasteful number, since it uses less digits than its factorization.

9998790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413.

The product of its (nonzero) digits is 367416, while the sum is 51.

The square root of 9998790 is about 3162.0863365822. The cubic root of 9998790 is about 215.4347790994.

It can be divided in two parts, 99 and 98790, that added together give a palindrome (98889).

The spelling of 9998790 in words is "nine million, nine hundred ninety-eight thousand, seven hundred ninety".